# lconv

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< c‎ | locale

Defined in header ``<locale.h>`` |  |
struct lconv; |  |

The struct `lconv` contains numeric and monetary formatting rules as defined by a C locale. Objects of this struct may be obtained with localeconv. The members of `lconv` are values of type char and of type char*. Each char* member except `decimal_point` may be pointing at a null character (that is, at an empty C-string). The members of type char are all non-negative numbers, any of which may be CHAR_MAX if the corresponding value is not available in the current C locale.

### Member objects

#### Non-monetary numeric formatting parameters

char* decimal_point | the character used as the decimal point (public member object)
char* thousands_sep | the character used to separate groups of digits before the decimal point (public member object)
char* grouping | a string whose elements indicate the sizes of digit groups (public member object)

#### Monetary numeric formatting parameters

char* mon_decimal_point | the character used as the decimal point (public member object)
char* mon_thousands_sep | the character used to separate groups of digits before the decimal point (public member object)
char* mon_grouping | a string whose elements indicate the sizes of digit groups (public member object)
char* positive_sign | a string used to indicate non-negative monetary quantity (public member object)
char* negative_sign | a string used to indicate negative monetary quantity (public member object)

#### Local monetary numeric formatting parameters

char* currency_symbol | the symbol used for currency in the current C locale (public member object)
char frac_digits | the number of digits after the decimal point to display in a monetary quantity (public member object)
char p_cs_precedes | 1 if currency_symbol is placed before non-negative value, ​0​ if after (public member object)
char n_cs_precedes | 1 if currency_symbol is placed before negative value, ​0​ if after (public member object)
char p_sep_by_space | indicates the separation of currency_symbol, positive_sign, and the non-negative monetary value (public member object)
char n_sep_by_space | indicates the separation of currency_symbol, negative_sign, and the negative monetary value (public member object)
char p_sign_posn | indicates the position of positive_sign in a non-negative monetary value (public member object)
char n_sign_posn | indicates the position of negative_sign in a negative monetary value (public member object)

#### International monetary numeric formatting parameters

char* int_curr_symbol | the string used as international currency name in the current C locale (public member object)
char int_frac_digits | the number of digits after the decimal point to display in an international monetary quantity (public member object)
char int_p_cs_precedes (C99) | 1 if int_curr_symbol is placed before non-negative international monetary value, ​0​ if after (public member object)
char int_n_cs_precedes (C99) | 1 if int_curr_symbol is placed before negative international monetary value, ​0​ if after (public member object)
char int_p_sep_by_space (C99) | indicates the separation of int_curr_symbol, positive_sign, and the non-negative international monetary value (public member object)
char int_n_sep_by_space (C99) | indicates the separation of int_curr_symbol, negative_sign, and the negative international monetary value (public member object)
char int_p_sign_posn (C99) | indicates the position of positive_sign in a non-negative international monetary value (public member object)
char int_n_sign_posn (C99) | indicates the position of negative_sign in a negative international monetary value (public member object)

The characters of the C-strings pointed to by grouping and mon_grouping are interpreted according to their numeric values. When the terminating '\0' is encountered, the last value seen is assumed to repeat for the remainder of digits. If CHAR_MAX is encountered, no further digits are grouped. The typical grouping of three digits at a time is "\003".

The values of p_sep_by_space, n_sep_by_space, int_p_sep_by_space, int_n_sep_by_space are interpreted as follows:

​0​ | no space separates the currency symbol and the value
1 | sign sticks to the currency symbol, value is separated by a space
2 | sign sticks to the value. Currency symbol is separated by a space

The values of p_sign_posn, n_sign_posn, int_p_sign_posn, int_n_sign_posn are interpreted as follows:

​0​ | parentheses around the value and the currency symbol are used to represent the sign
1 | sign before the value and the currency symbol
2 | sign after the value and the currency symbol
3 | sign before the currency symbol
4 | sign after the currency symbol

### Example

Run this code

    #include <locale.h>
    #include <stdio.h>

    int main(void)
    {
        setlocale(LC_ALL, "ja_JP.UTF-8");
        struct lconv* lc = localeconv();
        printf("Japanese currency symbol: %s(%s)\n", lc->currency_symbol, lc->int_curr_symbol);
    }

Possible output:

    Japanese currency symbol: ￥(JPY )

### References

- C23 standard (ISO/IEC 9899:2024):

  - 7.11/2 Localization <locale.h> (p: TBD)

- C17 standard (ISO/IEC 9899:2018):

  - 7.11/2 Localization <locale.h> (p: TBD)

- C11 standard (ISO/IEC 9899:2011):

  - 7.11/2 Localization <locale.h> (p: 223)

- C99 standard (ISO/IEC 9899:1999):

  - 7.11/2 Localization <locale.h> (p: 204)

- C89/C90 standard (ISO/IEC 9899:1990):

  - 4.4 LOCALIZATION <locale.h>

### See also

localeconv | queries numeric and monetary formatting details of the current locale (function)
C++ documentation for lconv

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